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P1 MCQ's preparation thread for chemistry ONLY!!!!
6. An ideal gas has negligible intermolecular forces, so the gas with the strongest intermolecular forces will least resemble an ideal gas. 21. 33. They're asking why it doesn't burn spontaneously, not why it has a high activation energy. It has a high activation energy because of the high... -
AS Physics P1 MCQs Preparation Thread.
Sure: d x sin(theta)=n x lambda. d & lambda are constants, so d/lambda=n/(sin(theta))=k. So 3/(sin45)=x/(sin90), because the highest order occurs at 90 degrees. -
Physics MCQ help
Because velocity is changing. There's acceleration, you see. -
AS Physics Paper 1 Questions URGENT
23. v=f x lambda. Amplitude isn't in the formula, so A and D are ruled out. B is true, because v is constant because K.E. is constant. C can be correct, but only if the frequency is constant; in this case, it isn't mentioned to be constant, therefore it can be ruled out. 35. V=IR=5x0.588=2.94V... -
Physics MCQ help
There's also the acceleration to consider. a=F/m. F=Exq. Therefore a=Eq/m. E is the same for all; q and m differ. So a=q/m. 3/7 is smaller than 1/1, 2/4 & 4/9. -
Revision for bio paper 1
18. Substance X replaces chromosome telomeres which promote DNA replication. Normally, telomeres are not completely replaced during mitosis. Abnormally, substance X is added & it replaces telomeres. That means DNA replication is promoted. DNA replication will cause continual cell division... -
AS Physics P1 MCQs Preparation Thread.
v=f x lambda. f=8/50=0.16 Hz. v=2 x pi x 2 x 0.16. K.E.=1/2xmx(v^2). -
P1 MCQ's preparation thread for chemistry ONLY!!!!
9. Ag is under Cu in the reactivity series, so electrons are given to Cu in preference to Ag at the cathode. 20. At each C=C double bond, a cis-trans isomer exists. That makes it 6. No idea where the other 2 come from. 7. P <-> Q + 2R Initial moles 2 0... -
P1 MCQ's preparation thread for chemistry ONLY!!!!
The cloudiness occurs because of the AgX. The rate of formation of cloudiness depends on how fast X- ions are released into the solution, so that Ag+ ions get attracted to them. How fast X- ions are released depends on the R-X bond energy. -
AS Physics P1 MCQs Preparation Thread.
It is necessary that they pass through the origin, because you want to compare their gradients. They have to pass through a common point, otherwise they'll be separate unrelated lines. And the tangents do touch the curve at only one point; you can ignore all points other than the one you're... -
P1 MCQ's preparation thread for chemistry ONLY!!!!
9. The ox. number of S in SO32- is +4 and is SO42- is +6. +6-+4=+2. 32. A. The ox. state of C in CO is 2+, and in CO2 it's 4+. Since CO readily turns into CO2, CO2 is more stable than CO. B. An exothermic reaction yields stable products. If the enthalpy of formation of a compound is very... -
AS CIE Physics Paper 1 Questions on Newton's Laws and Pressure
7. A consequence is something that happens because of something. C says that 'conservation of energy is a consequence of the 3rd law'. Which means that energy is conserved because of the 3rd law, in other words, energy is conserved because every action has an equal but opposite reaction. That... -
AS Physics P1 MCQs Preparation Thread.
Ah, my apologies. I'll try again: The question asks for the point on the I/V graph at which resistance is smallest. We know that the gradient of an I/V graph is 1/R. When R is smallest, 1/R (the gradient) is biggest. We need to check and see which point has a tangent to it with the biggest... -
AS Physics P1 MCQs Preparation Thread.
To get the angle between the 1st and 2nd orders, you first find the 1st order angle, then the 2nd, then you do minus the 1st from the 2nd. But you're not required to do that in the question. All you need to know is that if the number of visible orders increases, then the angles between all the... -
AS Physics P1 MCQs Preparation Thread.
R=V/I. The gradient of the graph=I/V, which is the 1/R. At D, the gradient is smallest (because it's almost flat, and a flat line's gradient is 0), so 1/the gradient at D will be even smaller. Intensity=Power/area=Energy/time/area, so Energy=Intensity x time x area. When A doubles... -
A level Biology: Post your doubts here!
Mitochondria and chloroplasts have their own DNA, and ribosomes are partly made up of RNA. That leaves the Golgi apparatus. -
AS Physics P1 MCQs Preparation Thread.
It's OK! And you're right about D. C is wrong. A: 'Charged particles are provided by the power supply.' That is wrong. The charged particles = the electrons. The electrons aren't provided by the power supply; they're already there in the wire. The charged particles are provided energy by the... -
AS (Biology) P1 MCQs Preparation Thread.
9 long divisions = 90. 9 small divisions = 9. Like this: -
AS Physics P1 MCQs Preparation Thread.
10. Force = rate of change of momentum, which is p/t. The gradient of a p/t graph is the force. To find the gradient, we use y2-y1/x2-x1. 12. The collision is inelastic. The initial momentum = 12. The final too must = 12. The final mass = 6. The final v=p/m=12/6=2. The final k.e.=1/2x6x(2^2)... -
AS (Biology) P1 MCQs Preparation Thread.
I'm not being disturbed, it's OK. And yeah, the questions are the same. It says that the length of one division is 0.01 mm, not 10 divisions.